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TPS65381A-Q1: How to stop the watchdog？

whong zhao
Genius 4180 points
Part Number: TPS65381A-Q1

Hello

I write code 

ecmpIfSetRegister(ECMP_SAFETY_FUNCTION_CONFIG, 0xFC);

ecmpIfSetRegister(ECMP_SAFETY_CHECK_CONTROL, 0x15);

That act the tps65381 watchdog,but if I want  to stop the watchdog .which dont reset the TMS570.

How to do that？

 

  • 0
    TI__Expert 4690 points

    Hi,

    By default the TPS65381A-Q1 will disable a transition to the RESET state when watchdog failure events are detected. The detection of bad watchdog events cannot be disabled.  

    If you want to avoid the TMS570 to reset you could replace:

    ecmpIfSetRegister(ECMP_SAFETY_FUNCTION_CONFIG, 0xFC);

    with 

    ecmpIfSetRegister(ECMP_SAFETY_FUNCTION_CONFIG, 0xF5);

    Regards,
    Ivan 

  • 0 in reply to Ivan Calzada
    Genius 4180 points

    Hi

    If ecmpIfSetRegister(ECMP_SAFETY_FUNCTION_CONFIG, 0xF5); The tps65381 cant reset the cpu,that isnot my purpose

    my purpose is that  I can disable the reset tps65381,because I find some error in my system I must  disable the 65381 reset function.

    that mean the tps35681 have the reset function,In this situation I can disable the reset function of  TPS65381

  • 0 in reply to whong zhao
    Genius 4180 points

    Hi

     I initialize  the tps65381 in active ,because  I need  the rese function ,but I also need  the disable the reset  function .because  my system  cannot  always  reset the cpu. 

  • 0 in reply to whong zhao
    TI__Expert 4690 points

    Hi,

    Sorry for the misunderstanding.

    I will try to summarize my understanding and feel free to correct me if I am wrong.

    Your use case assumes:

    • Initially WD_RST_EN is set to 1 AND
    • TPS65381A-Q1 is already in ACTIVE state AND
    • When a system level error occurs the TMS570stops sending valid Watchdog responses to the TPS65381A-Q1

    Under some scenario you would like to be able to prevent the TPS65381A-Q1 to reset by disabling the watchdog. 

    If my understanding is correct, then this functionality is not supported in the device. It is assume that if the TMS570 has stopped sending valid watchdog answers then a catastrophic error occurred on the MCU software and the MCU needs to be reset.

    In this device, once the device transitions to ACTIVE state it is not possible to reconfigure the watchdog and prevent a reset if WD_RST_EN has been set to 1 in SAFETY_FUNC_CFG Register.

    Regards,
    Ivan